For my MIB invites I did the same... I googled and saved, then played around a lot... Lightened and played with the contrast and changed colours. It is finicky, but you can get what you want that way, and it ended up looking great. Just play with whatever you find!

Hi Lindsay R, I was going to ask you about maps and I realized that today is your wedding day!!!! Congratulations!! I would like to see if you would email your maps to me because I can't access the ones that you uploaded. If you have time when you get back please let me know, but I hope your day is fabulous (as I'm sure it is!!!)!!!!